| Package | Affected versions | Patched versions |
|---|---|---|
| js-yaml | ≥ 4.0.0, < 4.1.1< 3.14.2 | 4.1.13.14.2 |
| js-yaml | ≥ 4.0.0, < 4.1.1< 3.14.2 | 4.1.13.14.2 |
In js-yaml 4.1.0, 4.0.0, and 3.14.1 and below, it's possible for an attacker to modify the prototype of the result of a parsed yaml document via prototype pollution (__proto__). All users who parse untrusted yaml documents may be impacted.
Problem is patched in js-yaml 4.1.1 and 3.14.2.
You can protect against this kind of attack on the server by using node --disable-proto=delete or deno (in Deno, pollution protection is on by default).
https://cheatsheetseries.owasp.org/cheatsheets/Prototype_Pollution_Prevention_Cheat_Sheet.html
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